Spiral spring.



Np. 769,362. PATENTED SEPT. 6. 1904.

A.E.TBRRY. SPIRAL SPRING. APPLICATION IILED JAN. 29, 1904.

NO MODEL.

Ifb venzor www UNITED STATEs Patented September 6, 1904.

ALFRED ERNEST TERRY, OF REDDITCH, ENGLAND.

. SPIRAL SPRING.

SPECIFICATION forming part of Letters Patent No. 769,362, datedSeptember 6, 1904.

Application filed January 29, 1904. Serial No. 191,217. .(No model.)

To all whom it may concern.-

Be it known that I, ALFR D ERNEST TERRY, a subject of the King of GreatBritain, residing at Redditch,-England, have invented certain new anduseful Improvements in Spiral I Springs, of which the following is aspecifica- 'by taking one or more of the end coils and turning them upat right angles to the length of the spring. Consequently that part ofthe wire which forms the connection between such loop and the coils ofthe body affords a comparatively weak connection and is veryliable todistortion or breakage by reason of the fact that the strength in thecoils of the body is very much in excessof the said bent part.

In this my invention I employ improved means whereby the said loop issupportably connected to one or more (generally two) coils of the bodyof the spring.

I have illustrated this my invention in the accompanying drawings, towhich reference is herein made and in which similar referencenumbersrefer to the same thing or part throughout the several views.

Figure 1 is a side view of the-one end of a coil-spring made accordingto this my invention. Fig. 2 is a sectional View of the end of thespring on line A B. Fig. 3 shows a modification of this my invention inwhich the supporting attachment is made to serve also as thepulling-loop. Fig. I shows the supporting attachment modified in shapeand adaptation to the coiled pulling-loop. Fig. 5 is a sectional view online C D, showing the rela tive position of the supporting attachmentand the coils of the pulling-loop. Fig. 6 is a side View, and Fig. 7 aplan view, of the invention,

showing the supporting attachment carried at right angles to and overthe ordinary loop.

Referring to Figs. land 2, 8 represents the coils of the body of thespring, which is coiled in the usual manner.

9 represents one or more coils which have been turned up at right anglesto the length of the spring 8, thus forming a loop for the tensionalpull of the spring.

10 is a supporting-bar which is carried across from side to side of thecoils 8, its end being turned upward andover one or more (but generallytwo) of the coils 8, the said bar passing over the lower portion 11 ofthe pulling coil-loop 9. Hence when the said loop is pulled such pulldoes not depend upon the strength of the connecting bent part 12, but istransferred, by means of the bar 10, to the end coils, which arethustaken hold off.

Referring now to Fig. 3, it will be seen that, if desired, the pull uponthe end coils of the spring may be effected without their being turnedor at right angles, as shown in Figs. 1 and 2, by making thesupporting-bar as shown at 10, so that it may serve as the pulling-loopdirect.

Referring further to Fig. 4, it will be seen that the loopingof theshape of the supporting-bar 1O may be somewhat extended beyond thatshown in Fig. 3, so as to embrace the exterior ofthe coils of the loop9, and thus again the pull upon the loop 9 may be said to be practicallytransferred to the said bar 10 It will be readily seen that thesupporting-bar 1O may be carried upon the'interior of the upper part ofcoil-loop 9, but being upon the eX- terior, as shown, appears to be themost convenient. I

In Figs. 6 and 7 Ihave shown how the supporting attachment-bar 10.may becarried across at right angles to the loop 9 and its upper part lyingagainst the upper part-of said loop, (exteriorly or, interiorly,) sothat thesaid loop and the attachment-bar may be simultaneously takenhold of for the pull of the spring.

By these means it is found that by reason 'of taking hold firmly of thetwo outer end coils of the body of the spring for the pull of the samewhen the said spring is extended the coils throughout the length of thespring are much more evenly spaced apart than when pulled by theordinary turned-up end coil.

- the manner herein described and shown such crystallizing action ispractically removed, and consequently the life of the spring very muchincreased.

WhatI claim as my invention, and desire to secure by Letters Patent, isv 1. A spiral spring having a coiled projection at one end thereof,constituting a pullingloop, and means independent of said projection orloop for transferring the effect thereof to the terminal coiled portionof the body of said spring.

2. In spiral springs the combination of the coils 8 of the body of thespring, coil-loop 9, the supporting-bar 10, whose ends are secured tothe end coils of the body of the spring, said bar being carried acrossand above the lower part of the loop 9, as set forth and shown.

3. A spiral spring having a coiled projection constituting apulling-loop, and a crossbar interlocked with the terminal coiledportion of the body of the spring and arranged to receive the directpull of said projection or oop.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ALFRED ERNEST TERRY. VVitnes'ses:

J. BERNARD HAYWARD, T. VERNON FELLoWs.

